Resetting Made Easy: Worcester Bosch Greenstar Boiler Help

Use this guide to reset your Worcester Bosch Greenstar boiler.

If your Worcester Bosch Greenstar boiler has suddenly stopped working or is showing a flashing blue light, a quick reset could be just what it needs to get going again. This guide will take you through the reset process step-by-step, so you can get your heat and hot water back up and running quickly and safely.

What Usually Causes a Worcester Bosch Greenstar Boiler to Need a Reset

Knowing why your boiler needs a reset can help you stop the same problems from happening again. Some of the most common reasons are low water pressure, frozen condensate pipes in cold weather, blocked air vents, or thermostat issues. Power outages and interruptions to your gas supply can also cause the boiler to go into fault mode.

While a simple Worcester Bosch Greenstar boiler reset often fixes the issue, repeated errors might point to a more serious problem inside—like a faulty sensor, diverter valve, or heat exchanger. Keep an eye out for warning codes or flashing lights on the display panel, as these give important clues about what’s wrong. If you find yourself resetting the boiler often, it’s a good idea to get professional help. Regular maintenance and annual servicing can catch small problems before they turn into costly repairs.

Don’t ignore repeated faults—reach out to a qualified engineer to make sure your heating system is running safely and efficiently.

Worcester Greenstar CDi Classic Boiler Reset

To bleed your radiators, you’ll need the following tools:

Press and hold the reset button [2] for three seconds.

The reset button [2] and fault indicator [3] will stop flashing.

If the reset works, your boiler will go back to normal operation.
If it doesn’t, the alert code will show again, and the blue operation/fault light will keep flashing.

Worcester Greenstar Si & CDi Compact Boiler Reset

To reset the boiler, just press the “Reset” button.

You’ll see “Reset” and a tick appear briefly on the display.

If the reset works, your boiler will go back to normal operation.
If it doesn’t, the alert code will show again, and the blue operation/fault light will keep flashing.

Worcester Greenstar i Boiler Reset

To reset the appliance, press the reset button briefly one time.

“Reset” and a tick will show briefly on the display.

If the reset is successful, the appliance will return to normal operation.
If it’s not successful, the alert code will appear again, and the blue operation/fault light will keep flashing.

Worcester Greenstar i Junior Boiler Reset

If there’s a fault, the reset button will flash once every second, and the blue mains indicator light will also flash.

To reset the boiler, press and hold the reset button for about five seconds. Once the boiler resets, the reset button light will turn off.

The mains indicator light will stop flashing.

Worcester Greenstar Ri Boiler Reset

If there’s a fault, the blue mains indicator light will flash.

To reset the boiler, turn the central heating temperature knob anticlockwise to the “RESET” position and hold it there for about five seconds. Then, turn the knob back to your original temperature setting.

Once the boiler resets, the mains indicator will stop flashing and the boiler should work normally, depending on your programmer and room thermostat settings. If the electrical power to the boiler has been interrupted, a reset fault condition may occur. Simply reset the boiler again following these steps.

Is your boiler still not working?

Sometimes, a reset just isn’t enough to fix the problem. If your boiler keeps going back into fault mode, it’s time to call a Gas Safe registered engineer.

At Hayward Heating & Plumbing, our Gas Safe engineers are ready to come to your rescue. We’ll quickly diagnose and repair your boiler to get everything running smoothly again. Get in touch